Mountain bike and bell: what they have in common

1. Step 1. Mountain bike — is made of — Vulcanized rubber. The tyres are rubber.
2. Step 2. Vulcanized rubber — is material for — Spacesuit. The pressure bladder is rubber.
3. Step 3. Spacesuit — evolved from — Diving suit. A sealed suit with an air supply.
4. Step 4. Diving suit — evolved from — Diving bell. Individual equipment.
5. Step 5. Diving bell — has part — Bell. A body open at the bottom.

Open Evothings